Brush



FIG. 1 is a front perspective view of the brush;

FIG. 2 is a top plan view of the brush;

FIG. 3 is a side elevation view of the brush, the other side views being identical; and,

FIG. 4 is a bottom plan view of the brush.

The broken-line showing of the brush bristles is environmental structure and for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a brush, as shown adn described. 